Regenerate proto files in opentelemetry-stackdriver.

[fiadliel]

Changes

#102 updated proto files, but they've diverged again.
Probably these should remain #[ignore]d. Maybe run a separate (scheduled?) build check for them?

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• Changes in public API reviewed (if applicable)

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 56.4%. Comparing base (56a6f45) to head (440a2cd).
Report is 30 commits behind head on main.

Files with missing lines	Patch %	Lines
opentelemetry-stackdriver/src/proto/api.rs	0.0%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main    #108     +/-   ##
=======================================
+ Coverage   52.3%   56.4%   +4.1%     
=======================================
  Files         38      39      +1     
  Lines       4967    5446    +479     
=======================================
+ Hits        2598    3072    +474     
- Misses      2369    2374      +5     

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[lalitb]

Probably these should remain #[ignore]d. Maybe run a separate (scheduled?) build check for them?

I think [ignore]d would hide any required proto changes. But if this happens too often, we may have to revisit again.